Beethoven wrote about 300【12】of music. He wrote some of his most beautiful pieces after he became deaf. It is hard for anyone to be deaf. But it is even worse for a musician than for【13】else. Think of not being able to hear the music you have written!
As a child Beethoven did not have a happy life. His father drank【14】.When the boy was only four，his father decided to make a musician【15】him. Hour after hour he had to practice【16】the violin. He learned so fast that he was able to make a concert tour when he was eleven. When he was seventeen，the great Mozart praised him. After he studied with Haydn. Beethoven was writing a great deal of music【17】.
Beethoven had an ugly face and a bad temper. He was often invited【18】the homes of wealthy people. They forgave him when his temper flared up. Illness made him become deaf when he was【19】thirty-one.
Beethoven wrote long pieces and short ones，gentle ones and【20】ones.
(11)

A. hear
B. listen
C. listen to
D. hear of